Quotes about illusion
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Source: Abba's Child: The Cry of the Heart for Intimate Belonging

“The public wants work which flatters its illusions.”

Source: Original Self: Living with Paradox and Originality

“How disturbing it is that our illusions are often our most important beliefs.”
Source: Intimacy: das Buch zum Film von Patrice Chéreau
“When illusions are shattered by truth, talent is set free.”
Source: Across the Nightingale Floor

Source: A Return to Love: Reflections on the Principles of "A Course in Miracles"
“Is not this world an illusion? And yet it fools everybody.”

“Dream delivers us to dream, and there is no end to illusion.”
1840s, Essays: Second Series (1844), Experience
Context: Dream delivers us to dream, and there is no end to illusion. Life is a train of moods like a string of beads, and, as we pass through them, they prove to be many-colored lenses which paint the world their own hue, and each shows only what lies in its focus.

“Normal is an illusion. What is normal for the spider is chaos for the fly.”

“There is no coincidence. Only the illusion of coincidence.”
Source: V for Vendetta, Vol. III of X

“How strange when an illusion dies. It's as though you've lost a child.”

“Routine feeds the illusion of safety…”
Source: Lamb: The Gospel According to Biff, Christ's Childhood Pal

Misattributed
Source: Robert McAfee Brown https://en.wikipedia.org/wiki/Robert_McAfee_Brown. Preface for the 25th anniversary edition of Night https://en.wikipedia.org/wiki/Night_%28book%29. Page v, Bantam Books paperback; 1982 reissue edition.

Letter to Besso's family (March 1955) following the death of Michele Besso, as quoted in Disturbing the Universe (1979) by Freeman Dyson Ch. 17 "A Distant Mirror", p. 193
Sometimes misquoted as "Reality is merely an illusion, albeit a very persistent one."
1950s
Variant: "He has departed from this strange world a little ahead of me. That means nothing. For us believing physicists, the distinction between past, present and future is only a stubborn illusion." Quoted in Einstein: His Life and Universe by Walter Isaacson (2008), p. 540 http://books.google.com/books?id=cdxWNE7NY6QC&lpg=PP1&pg=PA540#v=onepage&q&f=false.
Variant: "Now he has departed from this strange world a little ahead of me. That signifies nothing. For us believing physicists, the distinction between past, present, and future is only a stubbornly persistent illusion." Quoted in Albert Einstein: The Miracle Mind by Tabatha Yeatts (2007), p. 116 http://books.google.com/books?id=XiyyVYvQBKQC&lpg=PP1&pg=PT114#v=onepage&q&f=false.
Variant: "In quitting this strange world he has once again preceded me by a little. That doesn't mean anything. For those of us who believe in physics, this separation between past, present, and future is only an illusion, however tenacious." Quoted in The Structure of Physics by Carl Friedrich von Weizsäcker (1985), p. 288 http://books.google.com/books?id=DeexONN0zDgC&lpg=PR2&pg=PA288#v=onepage&q&f=false.
Variant: "Now he has departed a little ahead of me from this quaint world. This means nothing. For us faithful physicists, the separation between past, present, and future has only the meaning of an illusion, though a persistent one." Quoted in Einstein and Religion by Max Jammer (2002), p. 161 http://books.google.com/books?id=TnCc1f1C25IC&lpg=PP1&pg=PA161#v=onepage&q&f=false.
Variant: "Now he has preceded me by a little bit in his departure from this strange world as well. This means nothing. For those of us who believe in physics, the distinction between past, present, and future is only an illusion, however tenacious this illusion may be." Quoted in Einstein: A Biography by Jürgen Neff (2007), p. 402 http://books.google.com/books?id=B8K6n177ZwcC&lpg=PP1&pg=PA402#v=onepage&q&f=false

"Queen of the Black Coast" (1934)
Source: Conan the Barbarian Omnibus -The Original Stories
Context: He shrugged his shoulders. "I have known many gods. He who denies them is as blind as he who trusts them too deeply. I seek not beyond death. It may be the blackness averred by the Nemedian skeptics, or Crom's realm of ice and cloud, or the snowy plains and vaulted halls of the Nordheimer's Valhalla. I know not, nor do I care. Let me live deep while I live; let me know the rich juices of red meat and stinging wine on my palate, the hot embrace of white arms, the mad exultation of battle when the blue blades flame and crimson, and I am content. Let teachers and priests and philosophers brood over questions of reality and illusion. I know this: if life is illusion, then I am no less an illusion, and being thus, the illusion is real to me. I live, I burn with life, I love, I slay, and am content."

“Why do we call all our generous ideas illusions, and the mean ones truths?”
Source: The House of Mirth
Source: Kiss of a Demon King

Source: How to Change the World: Reflections on Marx and Marxism

The Awakening (1899)
Source: The Awakening, and Selected Stories
Context: The years that are gone seem like dreams -if one might go on sleeping and dreaming- but to wake up and find -oh! well! perhaps it is better to wake up after all, even to suffer, rather than to remain a dupe to illusions all ones life.

Source: If on a Winter's Night a Traveler

“It's life's illusions that I recall, I really don't know life at all”

“Because you can't keep up the illusion forever," I say. "No one has that much magic.”
Source: Rebel Angels

“Today, when I saw you, I realized that what is between us is nothing more than an illusion.”
Source: Love in the Time of Cholera

“If power was an illusion, wasn't weakness necessarily one also?”
Source: Vorkosigan Saga, A Civil Campaign (1999)

“All spiritual practices are illusions created by illusionists to escape illusion.”